add more comments

array/iarray_allocate.c

@@ -11,7 +11,11 @@
 #endif
 
 static iarray_page* new_page(size_t pagesize) {
+#ifdef __MINGW32__
+  void* x=malloc(pagesize);
+#else
   void* x=mmap(0,pagesize,PROT_READ|PROT_WRITE,MAP_ANONYMOUS|MAP_PRIVATE,-1,0);
+#endif
   if (x==MAP_FAILED) return 0;
   return (iarray_page*)x;
 }
@@ -41,7 +45,12 @@ void* iarray_allocate(iarray* ia,size_t pos) {
       break;
     p=&(*p)->next;
   }
-  if (newpage) munmap(newpage,ia->bytesperpage);
+  if (newpage)
+#ifdef __MINGW32__
+    free(newpage);
+#else
+    munmap(newpage,ia->bytesperpage);
+#endif
   {
     size_t l;
     do {

array/iarray_free.c

@@ -1,12 +1,18 @@
 #include <stdlib.h>
+#ifndef __MINGW32__
 #include <sys/mman.h>
+#endif
 #include <unistd.h>
 #include "iarray.h"
 
 static void freechain(iarray_page* p,size_t pagesize) {
   while (p) {
     iarray_page* n=p->next;
+#ifdef __MINGW32__
+    free(p);
+#else
     munmap(p,pagesize);
+#endif
     p=n;
   }
 }